(5x^2-20)+(4x-25)=180

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Solution for (5x^2-20)+(4x-25)=180 equation:


Simplifying
(5x2 + -20) + (4x + -25) = 180

Reorder the terms:
(-20 + 5x2) + (4x + -25) = 180

Remove parenthesis around (-20 + 5x2)
-20 + 5x2 + (4x + -25) = 180

Reorder the terms:
-20 + 5x2 + (-25 + 4x) = 180

Remove parenthesis around (-25 + 4x)
-20 + 5x2 + -25 + 4x = 180

Reorder the terms:
-20 + -25 + 4x + 5x2 = 180

Combine like terms: -20 + -25 = -45
-45 + 4x + 5x2 = 180

Solving
-45 + 4x + 5x2 = 180

Solving for variable 'x'.

Reorder the terms:
-45 + -180 + 4x + 5x2 = 180 + -180

Combine like terms: -45 + -180 = -225
-225 + 4x + 5x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-225 + 4x + 5x2 = 0

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-45 + 0.8x + x2 = 0

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + 0.8x + 45 + x2 = 0 + 45

Reorder the terms:
-45 + 45 + 0.8x + x2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + 0.8x + x2 = 0 + 45
0.8x + x2 = 0 + 45

Combine like terms: 0 + 45 = 45
0.8x + x2 = 45

The x term is 0.8x.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8x + 0.16 + x2 = 45 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = 45 + 0.16

Combine like terms: 45 + 0.16 = 45.16
0.16 + 0.8x + x2 = 45.16

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 45.16

Calculate the square root of the right side: 6.720119047

Break this problem into two subproblems by setting 
(x + 0.4) equal to 6.720119047 and -6.720119047.

Subproblem 1

x + 0.4 = 6.720119047 Simplifying x + 0.4 = 6.720119047 Reorder the terms: 0.4 + x = 6.720119047 Solving 0.4 + x = 6.720119047 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 6.720119047 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 6.720119047 + -0.4 x = 6.720119047 + -0.4 Combine like terms: 6.720119047 + -0.4 = 6.320119047 x = 6.320119047 Simplifying x = 6.320119047

Subproblem 2

x + 0.4 = -6.720119047 Simplifying x + 0.4 = -6.720119047 Reorder the terms: 0.4 + x = -6.720119047 Solving 0.4 + x = -6.720119047 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -6.720119047 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -6.720119047 + -0.4 x = -6.720119047 + -0.4 Combine like terms: -6.720119047 + -0.4 = -7.120119047 x = -7.120119047 Simplifying x = -7.120119047

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.320119047, -7.120119047}

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